As in ancient Germany the districts were known by the names of the rivers that watered them, and each was a _gau_, so it is in Borneo, where the rivers are the roads of communication, and give their names to the districts and to the people that inhabit them. Indeed, in Borneo one can see precisely at this day what was the ancient _Gau-verfassung_ in the German Empire.
The area of Sarawak is about 50,000 square miles, and the coast line about 500 miles.
The climate is hot and humid; it is especially moist during the N.E. monsoon, and less so during the S.W. monsoon. The former commences and the latter ends sometimes early and sometimes late in October, and in April the seasons again change. The months of most rain are December, January, and February; from February the rainfall decreases until July, the month of least rain, and increases gradually after that month. The average yearly rainfall is 160 inches. The maximum in any one year, 225.95 inches, was recorded in 1882, and the minimum 102.4 in 1888. The heaviest rainfall for one month, 69.25 inches, occurred in January, 1881, and the least, .66 inches, in August, 1877. The most in one day was 15.3 inches on February 8, 1876. Rain falls on an average 226 days in the year. These notes are taken from observations made in Kuching extending over thirty years.[41] At Sibu, the average rainfall for five years was 116 inches, at Baram 92 inches, and at Trusan 167 inches. Except in the sun at mid-day and during the early hours of the afternoon the heat is hardly ever oppressive, and the mornings, evenings and nights are generally cool. In 1906, the maximum average temperature was 91°.6, and the minimum 71°.2 Fahrenheit; the highest reading was 94° in May, and the lowest 69°.6 in July.[42]
In few countries are thunderstorms more severe than in Borneo, but deaths from lightning are not very common, and hail falls so rarely that when it does fall it is an awe-inspiring object to some natives. Archdeacon Perham records that during a very severe hailstorm in 1874 some Dayaks collected the hailstones under the impression that they were rare charms, whilst others fled from their house, believing that everybody and everything in it would be turned into a petrified rock, a woeful monument to future generations. To avert this catastrophe they boiled the hailstones and burnt locks of their hair.[43]